TY - JOUR
T1 - Ejection of boron from L10 phase for sputtered FePt-BN granular films by post-annealing
AU - Isurugi, Daiki
AU - Tanaka, Gento
AU - Saito, Takashi
AU - Tham, Kim Kong
AU - Ogawa, Tomoyuki
AU - Saito, Shin
N1 - Funding Information:
This work was supported by JST SPRING (Grant No. JPMJSP2114) and advanced storage research consortium (ASRC). The magnetic properties were measured at the Quantum Design Japan Physical Property Measurement Laboratory established in the Graduate School of Engineering, Tohoku University.
Publisher Copyright:
© 2022 The Japan Society of Applied Physics.
PY - 2023/3/1
Y1 - 2023/3/1
N2 - In this study, post-annealing under NH3 gas atmosphere was conducted in order to promote the two-phase separation of FePt-BN granular films. Magnetic properties and structural analysis for the Fe50Pt50-30 vol% BN granular films revealed that (1) saturation magnetization (M s) of the granular film increased from 500 to 650 emu cm−3 with increasing post-annealing time from 0 to 10 min, (2) the orientation of FePt grains changes from (002) to (111) and fully ordered with increasing post-annealing time up to 30 min, (3) the unit cell volume of FePt grains in the granular film decreased from 55.91 to 55.55 Å3 with increasing post-annealing time from 0 to 10 min, which suggests dissolve and eject of solid solution element. From the above, M s reduction for the FePt-BN granular films is considered to be caused by the solid solution of B in the FePt grains.
AB - In this study, post-annealing under NH3 gas atmosphere was conducted in order to promote the two-phase separation of FePt-BN granular films. Magnetic properties and structural analysis for the Fe50Pt50-30 vol% BN granular films revealed that (1) saturation magnetization (M s) of the granular film increased from 500 to 650 emu cm−3 with increasing post-annealing time from 0 to 10 min, (2) the orientation of FePt grains changes from (002) to (111) and fully ordered with increasing post-annealing time up to 30 min, (3) the unit cell volume of FePt grains in the granular film decreased from 55.91 to 55.55 Å3 with increasing post-annealing time from 0 to 10 min, which suggests dissolve and eject of solid solution element. From the above, M s reduction for the FePt-BN granular films is considered to be caused by the solid solution of B in the FePt grains.
KW - FePt-BN granular film
KW - L1 type FePt
KW - heat assisted magnetic recording
KW - post-annealing under NH gas atmosphere
KW - solid solution element
UR - http://www.scopus.com/inward/record.url?scp=85142424450&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85142424450&partnerID=8YFLogxK
U2 - 10.35848/1347-4065/ac962c
DO - 10.35848/1347-4065/ac962c
M3 - Article
AN - SCOPUS:85142424450
SN - 0021-4922
VL - 62
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
IS - SB
M1 - SB1013
ER -